java/TextAnalytics/REST/DetectLanguage.java

// 1. Create a new Java project in your favorite IDE (or new folder on your desktop). Create a class named DetectLanguage
// 2. Add the code provided below to your class.
// 3. Copy your Text Analytics key and endpoint into the code.
// 4. Make sure you have the Gson library installed.
// 5. Run the program in your IDE or use the command line to run.

import java.io.*;
import java.net.*;
import java.util.*;
import javax.net.ssl.HttpsURLConnection;

/*
 * Gson: https://github.com/google/gson
 * Maven info:
 *     groupId: com.google.code.gson
 *     artifactId: gson
 *     version: 2.8.1
 *
 * Once you have compiled or downloaded gson-2.8.1.jar, assuming you have placed it in the
 * same folder as this file (DetectLanguage.java), you can compile and run this program at
 * the command line as follows.
 *
 * Execute the following two commands to build and run (change gson version if needed):
 * javac DetectLanguage.java -classpath .;gson-2.8.1.jar -encoding UTF-8
 * java -cp .;gson-2.8.1.jar DetectLanguage
 */
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

class Document {
    public String id, text;

    public Document(String id, String text){
        this.id = id;
        this.text = text;
    }
}

class Documents {
    public List<Document> documents;

    public Documents() {
        this.documents = new ArrayList<Document>();
    }
    public void add(String id, String text) {
        this.documents.add (new Document (id, text));
    }
}

public class DetectLanguage {
    static String subscription_key_var;
    static String subscription_key;
    static String endpoint_var;
    static String endpoint;

    public static void Initialize () throws Exception {
        subscription_key = "PASTE_YOUR_TEXT_ANALYTICS_SUBSCRIPTION_KEY_HERE";
        endpoint = "PASTE_YOUR_TEXT_ANALYTICS_ENDPOINT_HERE";
    }

    static String path = "/text/analytics/v3.0/languages";
    
    public static String GetLanguage (Documents documents) throws Exception {
        String text = new Gson().toJson(documents);
        byte[] encoded_text = text.getBytes("UTF-8");

        URL url = new URL(endpoint+path);
        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "text/json");
        connection.setRequestProperty("Ocp-Apim-Subscription-Key", subscription_key);
        connection.setDoOutput(true);

        DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
        wr.write(encoded_text, 0, encoded_text.length);
        wr.flush();
        wr.close();

        StringBuilder response = new StringBuilder ();
        BufferedReader in = new BufferedReader(
        new InputStreamReader(connection.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
            response.append(line);
        }
        in.close();

        return response.toString();
    }

    public static String prettify(String json_text) {
        JsonParser parser = new JsonParser();
        JsonObject json = parser.parse(json_text).getAsJsonObject();
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        return gson.toJson(json);
    }

    public static void main (String[] args) {
        try {
            Initialize();

            Documents documents = new Documents ();
            documents.add ("1", "This is a document written in English.");
            documents.add ("2", "Este es un document escrito en Español.");
            documents.add ("3", "这是一个用中文写的文件");

            String response = GetLanguage (documents);
            System.out.println (prettify (response));
        }
        catch (Exception e) {
            System.out.println (e);
        }
    }
}